JSFiddle - React, Tailwind, and code Playground

JavaScript

var regex = /.*(\/|\\)/;

var path1 = 'C:\fakepath\filename.doc'.replace(regex, ''),
		path2 = 'C:\\fakepath\\filename.doc'.replace(regex, ''),
    path3 = '/var/fakepath/filename.doc'.replace(regex, '');

document.body.innerHTML = path1 + '<br>' + path2 + '<br>' + path3